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 ###Instrução: Qual Surface tem Opponents na final de mark edmondson sherwood stewart, e um Torneio de dallas , u.s.?
 ###Tabelas: CREATE TABLE top_markets_2000–2011 (top_markets_2000–2011_id AUTO_INCREMENT PRIMARY KEY, Country or territory VARCHAR, 2000 INT, 2001 INT, 2002 INT, 2003 INT, 2004 INT, 2005 INT, 2006 INT, 2007 INT, 2008 INT, 2009 INT, 2010 INT, 2011 INT) CREATE TABLE calendar (calendar_id AUTO_INCREMENT PRIMARY KEY, Round / Race VARCHAR, Circuit VARCHAR, Date VARCHAR, Pole Position VARCHAR, Fastest Lap VARCHAR, Winning driver VARCHAR, Winning team VARCHAR) CREATE TABLE u.s._television_ratings (u.s._television_ratings_id AUTO_INCREMENT PRIMARY KEY, Season INT, Episodes INT, Season premiere VARCHAR, Season finale VARCHAR, TV season VARCHAR, Rank VARCHAR, Households (millions) INT) CREATE TABLE wins_60 (wins_60_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Date INT, Tournament VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents in the final VARCHAR, Score in the final VARCHAR) CREATE TABLE season-by-season_national_league_records (season-by-season_national_league_records_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Division VARCHAR, Position VARCHAR, Played VARCHAR, Lost VARCHAR, Points VARCHAR)  
SELECT Surface FROM wins_60 WHERE Opponents in the final = mark edmondson sherwood stewart AND Tournament = dallas , u.s.